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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd522f7a98dbdf8731fe69368842d3f8fbb3bd14a0c1090990b5f111d28b8e9ed' 
  AND token = 'fvzSdMajRyS4OjNNPX7QnOjWG3VSryFVFiNGQWd+wEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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