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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25dbbc20f80ea6e9e88b83523ce54258cc8c2b02913fcabfd861bcdf0ddc6f27' 
  AND token = 'dx3C0+Kv4EaZlS0sxJvRCQfnnaYRc040znWM/Xv/qjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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