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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d60f0cf1a98878dab57516fe6abc920b1d9d11af303bad663d8b5b694332caa' 
  AND token = 'rGfyPLm5XQ7MlcGVfSp3AZMAGBjpRjlBwSBAQBGlNRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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