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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534295baeb73a13437188c2e81be23d737463f5ee313ad4eb58234d97f2e50b3' 
  AND token = 'QiTkX/JgvzlIomtuoMhIp7hGQBPYAlo8f8DUM7fFFHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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