SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d47b2b288259d2d0db7046a2fa2885798b18cf3c90535518bb07e2d99dc1bac' 
  AND token = '/XxYohi5Z6wXqlQEJvN4ARVlRJTwvG2wukuSj/CP89A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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