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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ed106e69204d9b8bf51ee8711222c55d0c821888db789bb22d67aeef2c33b3' 
  AND token = 'nNCJ7lmOEzTSyAUsWjk7fxbt5ePTs70NNA3YaT/hvZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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