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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56d28fd9dcf955afed543406841d9ab07bbc137473053d0c6982eb18b4ad06d' 
  AND token = 'KR6PgQzFfP1yXA4vsRRV6mz5gT9rpkgGVDT3vPkjF/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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