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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da792d6c213c9a48221a223b97ad9cf72aafe3dc3268556077acce88c8fa8e6' 
  AND token = '8CuHgBVfGVlakqzHnJvL73GyxK7PickDv7TwJ2RKnns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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