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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cee4973702a169b69da95420298d26a6e152f2956294797a3002c4e7209c957' 
  AND token = '5oK/35LMkq/vyCYl1fBgafYafkpFhPad9Q7EKLg4URQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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