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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b4bc739fc5d04e7c6d74cbeeeef31fc7a5bc2854d16d01e01875ea26db5cc5f' 
  AND token = '8fKcCN8xFX31KdOUMULv2FU29v9s+qp4IV5rIsmt9bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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