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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852a93fd5d62ae4b54ea716aa25bef97ac6dff3dc5b4e7ff832799232348a473' 
  AND token = 'o7fYp8oyAYVUAV+LpS7Eni5ihhTzwhs9MKWsNqB0wq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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