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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81fc541315a7e38233c086b03bfbbb10e1e9cc27631dd92986b5b0bc8c92e07d' 
  AND token = 'SceZl5g2d79nmIBejgDpgTpFBShzh/M8UIsQJqih6x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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