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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1560453a95d4417572f4f7185f2559e56c3779020b9e961731a80d9e661db4' 
  AND token = 'YoqAErnOE04Z3oTd3RdFGERaGzTPuT0eTV9aYRXmXu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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