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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5aa5add32dcac83cfdaeee6c123421a428634d48516e42b3e0aa4bef6e89b4' 
  AND token = '2zuxPp8a8znkYtw0C6OYcOrk9T/KKKIxRYSuOa1dsqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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