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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54c350a174a3d8183fd6840f5ab89b34921a056aafab782d536809ad3e643ab' 
  AND token = 'm+Zm1TsPvJtKHj+hKnkHlrJt58WqU9UfH0NjOuJXorI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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