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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c613df9f7fb09c62cecd5d7c7ec0c7951f4f099e7fe91a35a0b2312f0d87bf5' 
  AND token = 'WuW8USCQTnKE4WzOYI9XYvC67V5kHBdbcEkGYon9dcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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