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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89b10e12ceb8e6edf79fc271421677886e67daf500916e7f71e65d516cf9241' 
  AND token = 'mkrvoY2QzTMCc4Ojt6ZDftdhOq/CZir1N9AWe+E1Wqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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