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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a520c13df6ed4b83d16e40134405df52264d7ab6d9d7443b29c5e869feae5ed4' 
  AND token = '40bh73XqjwzoS4MCR0d71Tw7904X0Blaxw28RYPujNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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