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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60c174d732a4d39680a11f30bb700863fbc60093cc5eca999804255db14553a' 
  AND token = '1mu0qppVDgpTW3aY2daxO4/dxlJqAs+tWoRY4RxNk7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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