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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be6354eb873984cb839e5f122d7cee89893ed4bb3b8599fa086c0b5c430ffe0' 
  AND token = 'v90p1u7XB8pwM5p/wkEU59Jh8rVSv29RN1yeWdx5Rtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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