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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0294c66d5deea3ba5b95a0349958f53b27552dbf4e4b17bda6e1c727e4f6c2bc' 
  AND token = 'L6kqreQlseYvR2S2ZbxdREDFXcxHXjZ+OamWDQMOgWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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