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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aad380003cf79bf9817f529a9f60eb8818d9ff5bb4e201d70e3c01c11348b61' 
  AND token = '+id/pr6VAn/0TOCQjTNiS6At8tSk8e1N9qqLTwdwyQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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