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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8182921fe9ceaf17b59518718d2dde17423dd9fe254da45d2c66c85454193ebf' 
  AND token = 'rHq1P7MHDkUZ9SpZ+eXTvZorVsSYLue3JCBULZPl9FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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