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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65b77e3618f62e10313becde83d22ccf0c15c13fbd9ebc5f8ebd3a392b67c9a' 
  AND token = '+JeoCoLTVaLk7KUB++Rmi+NxWcK3v8It+92rEv/qUV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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