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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19acd339a91de3c2562755816ad77be124b3947b1d5ce5578505541e23d7d36' 
  AND token = 'QkpDEogt4MeOe5wHrZV3iv8AIpypsykk24HIr2sZWo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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