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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca43ec1351dfba03c6a3b29b1efc384b2185533dc4eec3b863d2388ad660ea1' 
  AND token = 'ZqOUhM/0HHwFE++9uYSQnVoAMZIlLg3L0llUf/D3RBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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