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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f31f97c236c90fd193bdfbb6ceb6cc3c56a7bb71aeedf81180ed0131ed0acf8' 
  AND token = '+VbuJJHOqMMGsWdXd6J6EUoJfBZr1S/e7xUyfhA5XQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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