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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7830ae51b79a47dd1f9b43bbab54111a9cbed30a3175de47cd0d07b68762af73' 
  AND token = 'WrotI2Ht741cwZUr1jRCMklIGZnqAz5JpUpTANQiJUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}