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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2f71af93bf72b993deef4ed95e7a1ae66d9ab8f6593c85c39a2fdcc4284ce8' 
  AND token = 'f1m4jDYYm4Wy8a8BQdxHdvwmBOjzm2MMg74vDD42N9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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