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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5993d689347688efa4b7fb476c48924f28f450cb433edef69ec563cc007b1fb4' 
  AND token = 'qTlziBJJtppDdOM0w9C4CluDlmZN5JFIQs9hz/kT2B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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