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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5c8d8e37461cf0cc29ecc8943469359dcc98834b08f7c4b197e37c98380a8a' 
  AND token = 'uG0AhZM1OPUvxeXdg7cBN9XwaaXrzWzwcBgwzn+v7+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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