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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb4cabd3f6b775392f7decc12f7f3679f91ac3923012c8b775989caae0c80a3' 
  AND token = '/KTBMWNvOIzLezV8F4TyKTS1/PfJ7PIRZCxuih57lNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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