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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018b82e3eff6f9dd995d815def8a6f55a473f730ea5cbe9f109ce4c9eeb225ee' 
  AND token = 'ZEGm7FBgGmTkUx6dLnJmydsDmIyXRtyp4lf6sq0FbOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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