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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542c860ca49af4b1f75369855aa0d9eeb21cdb8ab3fae384134e9482f480b727' 
  AND token = 'HJ+o6irhxNqKZC83pk8RmlDcBrdovEj54HxWRXbbtmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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