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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fa32fed2dc2e833e29de815fd658b05be6c789bdb0dbd9c28b7a25fde15929' 
  AND token = 'reFCXrRpcBP8vzHb3O5eoO5tCLhM53doogXiGwrrt3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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