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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc24ded9ffb540d71293093898e0433f8a11fabe61c63d85467f4ff90d9c89ef' 
  AND token = 'kleIOWHPhmsFTzxx5xq5Mm5zFrfJ5IJ2m1xrnvbLvbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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