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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535dd092a589ff3c8be00485c2719f69de6219453a3415a3df080b310ad43c76' 
  AND token = '+5TOnYcCaU+K2PQpM9TF6arrtwJWXQWdJRF33d6430M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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