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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809666d883227975c433a749bfe3c3714c802d296138675c1727941ca5a2a5c7' 
  AND token = 'Ty7cW9o3wyl3YQbGWiaSmhPR/SjsbEjRUvhaeU3uKnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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