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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f339a13a7ac9d2d2ee35ad4487adb1a6f695ac1e1ab4ff0f9f2f8d132dd0d8' 
  AND token = 'kBC8/Mp5GD0M0rjlun1Oe+Y29U7Mj1UNq7DT4l7VMWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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