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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad40e03b66c8fcd8b44b8766e5d785dbe764c25fb1ed4831e2c2a372221048a' 
  AND token = 'U2VXilErSYr8uek4siIORe9frdM8OD7dbGvDwWGBfSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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