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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f1ed9eb12bc55879af3ddb3a14e6705eba60ed07efeb3eec01ba123a170a55' 
  AND token = 'iRu7DK9S00Cp2KfrA8EATgyCYUlZlgYpRZPG9p/VX0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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