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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c062653570f7f6a78a24cf6782856769b0a68fc2f98c908c60adb6456b645dbe' 
  AND token = '8GGhE8N5Aw02PzVjCnhuq6jaiGbelyeZxN9ZXSbo6m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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