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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a0b06f921e1dbf2ffd78dab61606b20d00bb3f2d4f284742a8a50ce8a3214f' 
  AND token = 'obfi0CKIT3/r/OYG00DRUMOifQBVfw9YAdKiDaXazt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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