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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee70166e28b5ff070419319eec9b0e0115717b84ca09b2c5e9d7312a6bf751b1' 
  AND token = 'UOONX+V7J8hw/s1jCJve1s37BJhmn3r3A0EBOSGSXzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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