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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054aceec4ea56f1c3db2b5000f4aedd596af0d2c27b9b7a6df34c282a67c8c22' 
  AND token = '52USQG5VjRkb3kb60zvzm6xBiARhWg3iCBeleEBQWkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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