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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd002f7a8de7e6dd202afe3c430cce804aad61ac122a9d61eccb2763cc7028d17' 
  AND token = '9i/uRORYaCpArnegjwj1SbaQI93P8Fh32ZmWZbB9vsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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