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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb69eec3e8e2693ad4d10b83ff6efe585faf373082d9a48e43ab7dac59ae5fb' 
  AND token = 'WH0NY/NIzIOjk+MJPFrv9Eg/aNZT0+Wkg8sJYuSilBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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