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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef8b8c44fa7b87cc3082a890754a287e81d2a4faab54e4b3ee4b38e70347e9d' 
  AND token = 'SAzzZXLhMXAWUekLi7TdhsoZiO9gLEg0jE6aS9cyxI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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