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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8215292d976630dcce8d816cbf25e3521318dd51bd38cac7e2051a5dd8eded' 
  AND token = 'deXqzqC+AK9G3tpcwlK5YG8KkKG+zE57ftXYJ5JO1YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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