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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01b30201eca7fbb7e1f0ecfec3b59f4677240124ba0abbb0e933c74895b3e91' 
  AND token = 'nZwoaij7cs90agJsRu2yvWXfzA50o6qaJl7JdCiAhVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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