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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a43fa9bba9b587d054e80e97ccda317175b35084165747f2cfb9748a5aa7c3' 
  AND token = 'vLuid1Goz9/8vuMXu+Mr0LWAHjompjGbMkOIzpACs/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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