SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a78192845857a07b188cabf23487ebba10895255c5da769dd8df37c3c358bd0' 
  AND token = 'CqYsBJJ+wMB3wNHcK2G6OsJqxB7hAQSVcKg1YGlMxAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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