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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364cd831ff07c4ccb1f5bf1211b1e11bfc5e1b8416d64f0d59de84a7f1f2bdb7' 
  AND token = '9iMHj3QFk3basOZP9wKU+VM5GzloCEwFj9RN/5h3X3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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