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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518afe99ad97d4af80230cda589477345a793c204a421d8807d76f3527bb09b9' 
  AND token = 'Q1yptgujvjbbXcz9KQB7EmEilvBRcugIPcs3A237h6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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